Answer
a) N,N-diethylamine
b) p-nitroaniline
c) N-methyl-N-cyclopentylamine
d) N,N,N-tributylamine
Work Step by Step
a) For naming amine, we have to find alkyl groups that are attached with the N atoms. Here, two ethyl (-CH_{2}CH_{3}) groups are attached with the N atom. So, we use 'diethyl' and ending name will be 'amine'. As two ethyl groups are attached with N atoms but not C atoms, we use 'N,N' before diethyl. So, the complete name is 'N,N-diethylamine'.
b) There are two substituent present in para position (1,4) position of the benzene ring. One substituent is$ -NH_{2}$. Now, $C_{6}H_{5}NH_{2}$ is called aniline. One nitro group present as a substituent at the para position of aniline. So, the name is p-nitroaniline.
c) One methyl group and one cyclopentane group attached with N atom. So, the name will be N-methyl-N-cyclopentylamine.
d) three n-butyl ($CH_{3}CH_{2}CH_{2}CH_{2}-S groups are present attached with N atom. So, the name is N,N,N-tributylamine.
